Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR CURRENT RELATED DIAGNOSTIC TROUBLE CODES
1. Turn ignition switch ON.
2. Connect CONSULT and check for the following "current" "ENGINE" diagnostic trouble codes:
  - P0102-00
  - P0103-00
  - P0106-00
  - P0107-00
  - P0108-00
  - P012B-00
  - P012C-00
  - P012D-00
  - P0237-00
  - P0299-00
Are any of the above DTCs detected?

YES

Perform diagnosis of applicable DTC. Refer to DTC Index .

NO

GO TO 2 .
CHECK FOR NOX CURRENT RELATED DIAGNOSTIC TROUBLE CODES
Using CONSULT, check for the following NOx "current" "ENGINE" diagnostic trouble codes:
- U029D-00
- U029E-00
- P2201-00
- P2202-00
- P2209-00
- P220A-00
- P220B-00
- P229E-00
- P229F-00
- P22A7-00
- P2BAD-00
- P2BAF-00
Are any of the above DTCs detected?

YES

Perform diagnosis of applicable DTC. Refer to DTC Index .

NO

GO TO 3 .
CHECK FOR CURRENT AND PAST FUEL SYSTEM RELATED DIAGNOSTIC TROUBLE CODES
Using CONSULT, check for any fuel system related "current" or "past" "ENGINE" diagnostic trouble codes.

Any fuel pump or fuel injectors related DTCs detected?

YES

Perform diagnosis of applicable DTC. Refer to DTC Index .

NO

GO TO 4 .
CHECK FOR CURRENT AND PAST EGR RELATED DIAGNOSTIC TROUBLE CODES
Using CONSULT, check for any EGR related "current" or "past" "ENGINE" diagnostic trouble codes.

Any EGR related DTCs detected?

YES

Perform diagnosis of applicable DTC. Refer to DTC Index .

NO

GO TO 5 .
CHECK THE AIR OR EXHAUST SYSTEM FOR LEAKS
1. Start the engine and let it idle.
2. Check the charge air cooler and charge air plumbing for leaks:
  - Check the charge-air cooler connections for leaks between the turbocharger compressor outlet and the charge-air cooler.
  - Check the charge-air cooler connections between the charge-air cooler and the intake manifold.
  - Inspect the intake manifold gasket for leaks.
  - Inspect the charge-air cooler hoses for leaks or loose connections.
  - Inspect the charge-air cooler clamps to make sure they are tight.
  - Inspect the charge-air plumbing for cracks.
Air leaks present in the charge air system?

YES
- Repair or replace the leaking component.
- GO TO 7 .
NO

GO TO 6 .
CHECK THE EXHAUST SYSTEM FOR LEAKS
1. Turn ignition switch OFF.
2. Check the exhaust system plumbing for leaks:
  - Check the exhaust transfer tubes for leaks.
  - Check the exhaust bypass tubes for leaks.
  - Inspect the EGR valve for leaks.
  - Leaks can be easily noted by traces of soot.
  - Inspect the charge-air cooler clamps to make sure they are tight.
  - Inspect the charge-air plumbing for cracks.
Leaks or restrictions present in the exhaust system?

YES
- Repair or replace the leaking component.
- GO TO 7 .
NO
- Malfunctioning after treatment NOx sensors have been detected.
- Replace the after treatment intake NOx sensor. Refer to Removal and Installation .
- Replace the outlet NOx sensor. Refer to Removal and Installation .
- GO TO 7 .
ERASE DTC.
1. Connect all components.
2. Turn ignition switch ON.
3. With CONSULT, erase all DTCs.
4. Operate the engine within the conditions for setting DTC found in the DTC description.
5. Check for existing "ENGINE" diagnostic trouble codes.
Did the P221A-00 DTC return?

YES

Troubleshooting procedure needs to be repeated. Go to DTC Description .

NO

Repair complete.